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Before you write
Reporting a calculation error
Tell us which calculator you used, the exact numbers you entered, the result it showed, and the result you expected along with how you worked it out. A specific example is the fastest thing for us to reproduce and fix.
Suggesting a calculator
Describe what you are trying to work out. We add tools where there is a standard, well-defined method we can explain properly, and we would rather build fewer calculators well than many badly.
What we can’t help with
We can’t review your personal finances, give tax, legal or medical advice, or interpret a health reading. The calculators are planning and reference aids; for decisions that matter, speak to a qualified professional.
How your message is handled
Your message is delivered to us by email through a form service. We use your name and address only to reply, as described in our Privacy Policy.
Response Time
1–2 business days
Calculation Errors
Investigated promptly
Tool Requests
Always considered